I seriously doubt whether most Tiger or Jetstar consumer behaviour is influenced by the cancellation rate.
The overarching motivation for most ticket purchases by customers on these carriers is that it be the lowest priced.
Apparently, if the marketing data is to be believed, there is significant price elasticity in the LCC domain. Fare differences of as little as $5-10 will alter consumer behaviour.
While holiday makers and infrequent flyers can get a little stroppy when they are late (or cancelled), it is regular, frequent and business travellers who are much more interested in OTP and cancellation rates.
PG